1lg7c=-0.512×13 0.4 =-0.20 1+3.28×0.3×√0.4 7cr=0.63 aa-=0.63×0.1=0.063(mo/L 1gyo=-0.512×2 √0.4 =-0.708 1+3.28×0.4×V0. yso=0.20 aso =0.20×0.1=0.020(mol/L) 0.20 1 3.28 0.3 0.4 0.4 lg 0.512 12 Cl = − + × × γ − = − × 0.63 Cl γ − = 0.63 0.1 0.063 Cl a − = × = (mol/L) 0.708 1 3.28 0.4 0.4 0.4 lg 0.512 22 so24 = − + × × γ − = − × 2 0.20 SO4 γ − = 2 0.20 0.1 0.020 SO4 a − = × = (mol/L)